The Influence of Air and Liquid Properties on Airblast Atomization

Rizkalla, A. A.; Lefebvre, A. H.

doi:10.1115/1.3447309

Cited by 151 publications

(91 citation statements)

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“…' Dobbins, er al. (1962) described the basic theory and optical setup which is used extensively, most recently by Lefebvre and co-workers (e.g ., Rizkalla and Lefebvre, 1975;Lorenzetto and Lefebvre, 1977;Lefebvre, 1983, 1984). Swithenbank, et al (1977) extended the concept of Dobbins to look, not at the distribution of intensity, but at the distribution of energy.…”

Section: Overviewmentioning

confidence: 99%

Application of Laser Interferometry to the Study of Droplet' Gas Phase Interaction and Behavior in Liquid Spray Combustion Systems

McDonell

Samuelsen

1990

Combustion Science and Technology

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Section: Overviewmentioning

confidence: 99%

Application of Laser Interferometry to the Study of Droplet' Gas Phase Interaction and Behavior in Liquid Spray Combustion Systems

McDonell

Samuelsen

1990

Combustion Science and Technology

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“…However, there is an extensive broadening of the droplet diameter range in the (Fig 1) and Rizkalla (1974) (Fig 4). This was expected since the low air density at low pressures causes a reduction in the shear stresses, which results in poor atomization of the fuel liquid sheet.…”

Section: Effect Of Sub-atmospheric Pressurementioning

confidence: 99%

“…4 indicates the different break-up modes possible, depending on the Weber number. Rizkalla (1974) and Rizkalla and Lefebvre (1975) conducted a wide range of experimental studies on the effects of air and fuel properties on the atomization quality of an airblast atomizer.…”

Section: Experimental Studiesmentioning

confidence: 99%

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Effect of Combustor Geometry on Performance of Airblast Atomizer Under Sub-Atmospheric Conditions

Grech

Mehdi

Zachos

et al. 2012

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:One of the certification requirements that a jet engine has to fulfil is its altitude relight capability. Relighting an aero gas turbine engine at high altitudes is more challenging than at sea level conditions. The pressure, air velocity, and temperature within the combustor at such conditions are very low, hindering the fuel atomization and evaporation process. After ignition, combustion efficiency can be relatively low due to the poor fuel atomization quality, leading to slow shaft acceleration rates. Further studies in this field can help determine and predict the fuel spray characteristics, which limit the relight and pull-away capability of the engine at these sub-idle conditions. Reported in this paper is the CFD analysis of a typical airblast atomizer, simulated at different sub-idle operating conditions. Two sets of models were used; one with a simple liner-only combustor with co-flow air, and the other with a more detailed geometry, including wall cooling slots, primary and secondary dilution holes, and co-flow air. For the simpler model, three different inner and outer liner wall spacing were modelled to examine the effect of the chamber volume on the fuel spray behaviour. The CFD models were then run at a chamber pressure of 101, 41 and 31kPa, typical of sub-idle conditions. The effect of such conditions on the atomization quality of the fuel spray was analysed. The study carried out indicates how the chamber pressure, chamber volume and AFR (through amount of co-flow air introduced) significantly affect the resulting spray characteristics. A parametric analysis was performed to extract a correlation between the spray SMD (Sauter Mean Diameter) and fuel flow rate.

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“…Rizkalla and Lefebvre [4] investigated in detail the effects of both air and liquid properties on airblast atomization quality. Rizkalla and Lefebvre drew certain general conclusions concerning the main factors governing the mean drop size.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Spray – Swirl – Acoustics Interactions

Gurubaran

Sujith

2011

International Journal of Spray and Combustion Dynamics

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Combustors with fuel-spray atomizers are particularly susceptible to pressure or velocity oscillations resulting from the occurrence of thermoacoustic oscillations. Experimental investigations of distilled water spray -swirl -acoustic interactions are presented. The presence of a swirl flow field alters the behavior of water spray drastically. Investigations showed complex behavior of water sprays in an acoustic cycle. In the presence of acoustic oscillations the phase averaged droplet diameter variation with in an acoustic cycle is more at the axial locations compared with off axis locations. The phase averaged axial velocity variation of the droplets is high compared to that of phase averaged radial and tangential velocities with in an acoustic cycle. Periodic clustering of droplets in the spray field is observed in the presence of acoustic field. A maximum particle count of 14 times the minimum count in a phase angle bin is observed within an acoustic cycle for the acoustic pressure amplitude of 3000 Pa. The droplet diameter distribution in the spray field is affected in the presence of acoustic oscillations.

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The Influence of Air and Liquid Properties on Airblast Atomization

Cited by 151 publications

References 0 publications

Application of Laser Interferometry to the Study of Droplet' Gas Phase Interaction and Behavior in Liquid Spray Combustion Systems

Application of Laser Interferometry to the Study of Droplet' Gas Phase Interaction and Behavior in Liquid Spray Combustion Systems

Effect of Combustor Geometry on Performance of Airblast Atomizer Under Sub-Atmospheric Conditions

Dynamics of Spray – Swirl – Acoustics Interactions

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